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CHIP DETECTOR SWITCH WITH CLEANING MEANS

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention proposes a technique to clean chips in the gearbox of an engine or a wind turbine. The technique includes a chip detector switch with cleaning means. The cleaning means are added to remove chips mechanically. The cleaning means is actuated, for example, by an electric motor, so that no personnel are required and removal of the switch is not required. A wiper is added to the clip detector switch which is remotely operated and sweeps the particles from the chip detecting gap.

Country

United States

Language

English (United States)

This text was extracted from a Microsoft Word document.

At least one non-text object (such as an image or picture) has been suppressed.

This is the abbreviated version, containing approximately
42% of the total text.

CHIP
DETECTOR SWITCH WITH CLEANING MEANS

BACKGROUND

The present invention generally relates to
chip detectors in engines and more particularly to a chip detector switch with cleaning
means in the gearbox.

In general, chip detectors are located in
gearbox or engine oil passages or tank. The chip detectors utilize collection
of metal particles or chips between two electrodes. the chip detectors monitor change
of resistance between electrodes as an indicator of a failure occurring in the
gearbox or engine. For example, failure emanating by surface fatigue of gears
or bearings which generates loose metal particles in the oil of the gearbox or
engine. Early detection of a failure allows intervention such as shutdown of
equipment and repair, among others, before the failure progresses to a
condition where repair is no longer possible, or failure results in extensive
collateral damage. A chip detector switch generates false alarms due to
collection of normal small wear debris which are accumulated across the
electrodes. In engines or gearboxes which are maintained or inspected
frequently, this is not a problem as normal debris is removed during maintenance.
However, in machines, such as wind turbines, which operate for months without
maintenance, debris will accumulate and a false alarm requires the turbines to
be shut down and personnel to climb the tower, remove the switch, cleaning and
re-installation.

A conventional technique includes an
electrical device which applies a high current to burn or melt the accumulated debris.
However, the technique is costly and degrades oil. Further, there are chances
that the technique does not clear all the debris, in case, particles weld to
each other and electrodes.

Another conventional technique uses an
electromagnet instead of a permanent magnet to release the chips when the
electromagnet is deactivated. However, the technique requires constant
application of power which consumes energy. Further, if the power is lost due to
power failure, particles are inadvertently released. Also, non-ferrous
particles are not affected by the electromagnet and remains on the chip
detector switch.

Therefore, there is a need in the art for
a technique to clear all debris from the engine.

BRIEF DESCRIPTION OF THE
DRAWINGS

Figure 1 depicts
a housing wall of the gearbox or engine threaded to accept the chip detector
switch.

Figure 2 depicts end view of the chip detector switch.

DETAILED DESCRIPTION

The present invention proposes a technique
to clean chips in gearbox of an engine. The technique includes chip detector
switch with cleaning means. The cleaning means are provided to remove
chips mechanically. The cleaning means is actuated, for example, by an electric
motor, so that no personnel are required and removal of switch is not required.
A wiper is added to the clip detector switch which is remotely operated and
sweeps particles from chip detecting gap. The wiper is operated by an electric
motor. It is also possible to...